Animal-incursion-resistant raised bed gardening system

ABSTRACT

Disclosed is a system having a base and a screened enclosure for disposition on the ground for growing plants. The base forms a hollow enclosure into which a growing medium can be disposed. The screened enclosure is mounted on the base and is in the form of a plurality of elongated frame members, plural upper screen members and plural lower screen members. Each of the screen members has an opposed pair of side edges, a top edge and a bottom edge. The frame members extend upward from the base and are spaced apart from one another. Each of the frame members includes a first respective section arranged to slidably receive a respective side of a respective lower screen member therein and a second respective section arranged to slidably receive a respective side of a respective upper screen member therein. Each of the upper and lower screen members are arranged to be individually removed from their respective sections of their associated frame members to enable each of the screen members to be individually removed from the frame members.

CROSS-REFERENCE TO RELATED APPLICATIONS

N/A.

BACKGROUND OF THE INVENTION

This invention relates to gardening systems and more particularly toraised bed gardening systems including means to protect the plants fromanimals.

Raised garden beds are becoming more and more popular both in commercialagriculture and in home agricultural settings inasmuch as they providenumerous advantages over normal-grade garden beds. For example, raisedbeds permit precise control of soil conditions while offering betterwater drainage and less soil compaction. The use of raised beds has ledto the development of numerous types of containment systems to hold thesoil and keep unwanted pests or animals out of the garden. Moreover suchsystems also include various means for enabling access to the raisedbed.

The patent literature includes a number of patents directed to raisedbed systems. For example see, U.S. Pat. No. 7,424,787 (Singer); U.S.Pat. No. 7,490,435 (Singer); RE44,055 (Singer); U.S. PublishedApplications US2007/0130824 (Teich); US2010/0224848 (Singer et al.);US2011/0252702 (Gazjuk); US 2011/0283611 (Topping); US2013/0174480(Gabelmann); and European Published Application EP2273040(Vandermaessen).

While those prior art raised bed systems including enclosures forkeeping out animals or pests are generally suitable for their purposesthey nevertheless leave something to be desired from the standpoints ofsimplicity of construction, ease of use and effectiveness. Accordingly,a need exists for a raised bed system which achieves those ends. Thesubject invention does so.

All references cited and/or identified herein are specificallyincorporated by reference herein.

SUMMARY OF THE INVENTION

One aspect of this invention entails a system for disposition on theground for growing plants. The system basically comprises a base and ascreened enclosure. The base is arranged to be disposed on the groundand has a plurality of interconnected sections forming a hollowenclosure into which a growing medium can be disposed. The screenedenclosure is mounted on the base encircling the hollow enclosure. Thescreened enclosure comprises a plurality of elongated frame members, atleast one upper screen member and at least one lower screen member. Eachof the screen members has an opposed pair of side edges, a top edge anda bottom edge. The plurality of elongated frame members are connected tothe base and extend upward therefrom. A first one of the frame membersand a second one of the frame members define a gap therebetween. Each ofthe first and second frame members comprises a respective sectionarranged to receive a respective side of the lower screen member,wherein the bottom edge of the lower screen member can be placed in aposition immediately adjacent the base. Each of the first and secondframe members additionally comprise a section arranged to receive arespective side of the upper screen member therein, wherein the bottomedge of the upper screen member can be placed in a position immediatelyadjacent the top edge of the lower screen member. Each of the upper andlower screen members are also arranged to be individually removed fromits respective section of its associated frame members to enable each ofthe screen members to be individually removed from the frame members.

In accordance with one preferred aspect of this invention each of thefirst and second frame members comprises a first track section arrangedto slidably receive a respective side of the lower screen member thereinwherein the bottom edge of the lower screen member can be slid to aposition immediately adjacent the base, and wherein each of the firstand second frame members additionally comprises a second track sectionarranged to slidably receive a respective side of the upper screenmember therein wherein the bottom edge of the upper screen member can beslid to a position immediately adjacent the top edge of the lower screenframe. The lower screen member is arranged to be individually slid outof the first track section of the first and second track members toenable the lower screen member to be individually removed from thescreened enclosure. The upper screen member is arranged to beindividually slid out of the second track section of the first andsecond track members to enable the upper screen member to beindividually removed from the screened enclosure.

In accordance with another preferred aspect of this invention thescreened enclosure comprises plural upper screen members and plurallower screen members, and wherein respective ones of the plural upperscreen members and respective ones of the plural lower screen membersare slidably disposed between adjacent frame members, with the bottomedge of each of the lower screen members being disposed immediatelyadjacent respective portions of the base, and with the bottom edge ofeach of the upper screen members being disposed immediately adjacent thetop edge of a respective one of the lower screen members.

DESCRIPTION OF THE DRAWING

FIG. 1 is a perspective view of one exemplary embodiment of an animalincursion resistant raised bed gardening system constructed inaccordance with this invention;

FIG. 2 is a plan view of an exemplary large grid, upper screen memberforming a portion of the system shown in FIG. 1;

FIG. 3 is a plan view, similar to FIG. 2, but showing an exemplary smallgrid, lower screen member forming a portion of the system shown in FIG.1;

FIG. 4 is an enlarged perspective view of a portion of the system shownin FIG. 1;

FIG. 5 is reduced perspective view of the exemplary embodiment of thesystem shown in FIG. 1, with one of the lower, small grid screen membersbeing shown in a slightly raised or elevated position;

FIG. 6 is an enlarged perspective view of a portion of the system shownin FIG. 5;

FIG. 7 is an enlarged sectional view taken along line 7-7 of FIG. 1,showing the construction of a corner frame member for slidablysupporting a pair of large grid, upper screen members and for slidablysupporting a pair of small grid, lower screen members at a corner of thesystem of FIG. 1; and

FIG. 8 is an enlarged sectional view taken along line 8-8 of FIG. 1,showing the construction of a center frame member for slidablysupporting a pair of large grid, upper screen members and for slidablysupporting a pair of small grid, lower screen members at the center ofthe front of the system of FIG. 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring now to the various figures of the drawing wherein likereference characters refer to like parts, there is shown at 20 in FIG. 1one exemplary embodiment of a raised bed gardening system constructed inaccordance with this invention.

The system 20 basically comprises a base 22 and a screened enclosure 24.The base 22 is an assembly of plural planks or beams 26 which areinterconnected, as will be described later, to form at least one hollowenclosure that is arranged to be disposed on the ground. In theexemplary embodiment shown in Fig. I, the system includes two suchhollow enclosures 28A and 28B. The interior of each hollow enclosureformed by the planks 26 of the base serve to receive a growing medium,e.g., soil, nutrients, etc. to form a raised bed or garden for growingone or more plants or vegetables therein. The material making up theplanks or beams of the base can be any suitable materials which can holdup to typical soil conditions. In accordance with a preferred embodimentof this invention the planks or beams are wood or composite wood.

The screened enclosure 24 is mounted on the base 22 encircling the beds28A and 28B and includes a series of protective screens that helpgardeners keep what they sow in the bed(s), safe from ravaging by largeor small animals. To that end the screened enclosure 24 basicallycomprises a plurality of elongated post or frame members 30, pluralupper screen members 32 and plural lower screen members 34. As will bedescribed later the upper screen members are designed to keep largeanimals, such as deer, out of the garden, while the lower screen membersare designed to keep small animals, such as rabbits and ground hogs outof the garden. The post or frame members 30 serve to slidably supportthe screen members in such a manner than any particular screen membercan be individually raised, lowered or entirely removed from theenclosure. This feature provides the gardener with complete and easyaccess to the contents, e.g., the plants/vegetables, growing in theraised bed(s).

In accordance with one preferred embodiment of this invention the upperscreens are located at the top portion of the screened enclosure 24 andare in the form of a relatively large mesh or grid to keep large animalsfrom gaining access to the bed(s) when the screens are in their normal(lowered) position. The lower screens are located at the bottom portionof the screened enclosure 24, e.g., adjacent the base 22, and are in theform of a relatively small mesh or grid to keep small animals fromgaining access to the bed(s) when the lower screens are in their normal(lowered) position.

Turning now to FIGS. 2, 7 and 8 the details of the upper screen members32 will now be described. Each upper screen member comprises a wire meshor grid panel 36 and a peripheral frame 38. The panel 36 in theexemplary embodiment shown is rectangular, but that shape is merelyexemplary. Thus, the panel 36 can be of any shape desired, e.g., square,etc. The resulting upper screen member has a top edge 32A, a bottom edge32B, and a pair of opposed side edges 32C and 32D. As best seen in FIGS.7 and 8 the frame 38 is generally U-shaped in cross section so that itcan receive the peripheral edge of the mesh panel 36. The mesh panel 36,as noted above, of a relatively large, e.g., 2″ square, mesh or grid andcan be formed of any suitable material, e.g., welded steel galvanizedwire. The frame 38 can also be formed of any suitable material. In anexemplary preferred embodiment it is formed of aluminum.

The lower screen members 34 are similar in construction to the upperscreen members 32. To that end, as best seen in FIG. 3 each lower screenmember 34 comprises a wire mesh or grid panel 40 and a peripheral frame42. The panel 40 in the exemplary embodiment shown is rectangular, butthat shape is merely exemplary. Thus, the panel 40 can be of any shapedesired, e.g., square, providing that its width is the same as the widthof the upper screen member since any particular upper screen member andits associated lower screen member are slidably supported between a pairof adjacent post or frame members 30, as will be described in detaillater.

Each lower screen member has a top edge 34A, a bottom edge 34B, and apair of opposed side edges 34C and 34D. While not shown, the frame 42 isgenerally U-shaped in cross section, like frame 36, so that it canreceive the peripheral edge of the mesh panel 40. The mesh panel 40, asnoted above, of a relatively small, e.g., 0.5 inch square, mesh or gridand can be formed of any suitable material, e.g., woven aluminum wire.The frame 42 can also be formed of any suitable material. In anexemplary preferred embodiment it is formed of aluminum.

Even though the lower screen members are of a mesh whose size is smallerthan that of the upper screen members, it is nevertheless of sufficientsize to allow sufficient sunlight to pass therethrough to encourageplant growth performance in the bed.

As can be seen in FIGS. 1 and 5, and as mentioned above, the post orframe members 30 are spaced from each other and extend upward around theperiphery of the base 22. The spacing or gap between adjacent post orframe members is selected to be just slightly larger than the width ofthe upper and lower screen members 32 and 34, respectively. The post orframe members are of two types, namely, a corner post or frame member30A and a side post or frame member 30B. Each corner frame member 30A islocated at a respective corner of the enclosure 24 to releasablyslidably support the respective side edges of the upper and lower screenmembers at that corner. Each side frame member 30B is located on arespective side of the enclosure 24 between two corner frame members 30Ato releasably slidably the respective side edges of the upper and lowerscreen members on each side of the side frame member.

Turning now to FIG. 7, the details of a typical corner post or framemember 30A will now be described. To that end, as can be seen eachcorner post or frame member 30A is an elongated member that is formed ofany suitable material, e.g., extruded aluminum. Each corner frame member30A is of square cross section and includes a pair of first elongated,linear channels or track sections 44 projecting outward from respectiveinside surfaces of the frame member 30A so that the track sections 44are oriented perpendicularly to each other towards the adjacent bed. Theother two surfaces of each corner frame member constitute an outsidesurface and are directed away from the bed.

As best seen in FIGS. 4 and 6, the track sections 44 are located at thebottom portion of each corner frame member and are arranged toreleasably slidably receive respective sides of the frame 42 of thelower screen members 34 at that corner. Thus, the bottom edge 34B of theframes of those lower screen members 34 can be slid to a positionimmediately adjacent the base 22 like shown in FIG. 1. Each of thecorner frame members 30A also includes a pair of second elongated,linear channels or track sections 46 projecting outward from respectivesurfaces of the frame member 30A so that the track sections 46 areoriented perpendicularly to each other. The track sections 46 arelocated at the top portion of each corner frame member and are set-backfrom the position of the track sections 44, i.e., are closer to the bedthan the track sections 44. In accordance with one preferred exemplaryembodiment of this invention, the track sections 46 are set backapproximately 1 inch from the track sections 44. The track sections 46are arranged to releasably slidably receive respective sides of theframes 38 of the upper screen members 32 at that corner. Thus, thebottom edge 32B of the frames 38 of the upper screen members 32 can beslid to a position immediately adjacent the top edge 34A of the frame ofthe underlying lower screen member.

Turning now to FIG. 8, the details of a typical side post or framemember 30B will now be described. To that end, as can be seen each sidepost or frame member 30B is an elongated member that is formed of anysuitable material, e.g., extruded aluminum. Each side frame member 30Bis of square cross section and includes a pair of first elongated,linear channels or track sections 44 projecting outward from respectiveopposed surfaces of the frame member 30B so that the track sections 44are oriented 180 degrees to each other. The track sections 44 arelocated at the bottom portion of each side frame member and are arrangedto releasably slidably receive respective sides of the frame 42 of thelower screen members 34 on either side thereof. Thus, the bottom edge34B of the frames of those lower screen members 34 can be slid to aposition immediately adjacent the base 22 like shown in FIG. 1. Each ofthe side frame members 30B also includes a pair of second elongated,linear channels or track sections 46 projecting outward from respectivesurfaces of the frame member 30A so that the track sections 46 areoriented 180 degrees to each other. The track sections 46 are located atthe top portion of each side frame member and are set-back from theposition of the track sections 44, i.e., the track sections 46 arelocated closer to the bed than the track sections 44. In accordance withone preferred exemplary embodiment of this invention, the track sections46 of the side post or frame members 30B are set back approximately 1inch from the track sections 44. The track sections 46 are arranged toreleasably slidably receive respective sides of the frames 38 of theupper screen members 32 on either side thereof. Thus, the bottom edge32B of the frames 38 of the upper screen members 32 can be slid to aposition immediately adjacent the top edge 34A of the frame of theunderlying lower screen member, like shown in FIG. 1.

Each of the track sections 44 and 46 is open at the top end thereof.Thus, any lower screen member 34 which is located in the track sections44 of adjacent frame members 30 can be slid upward, like shown in FIGS.5 and 6, to any position with respect to its frame members to providethe user with access to the bed within the enclosure 24. In fact, sincethe top of each track section 44 is open each lower screen memberlocated therein can be slid upward beyond the top end of the tracksection to completely remove the lower screen member from the enclosure24. In a similar manner, any upper screen member 32 which is located inthe track sections 46 of adjacent frame members 30 can be slid upward toany position with respect to its frame members to provide the user withaccess to the bed within the enclosure 24. Also, since the top of eachtrack section 46 is open each upper screen member located therein can beslid upward beyond the top end of the track section 46 to completelyremove the upper screen member from the enclosure 24.

While not shown, the track sections 46 include a stop at the bottomthereof to prevent the upper screen members from sliding out of thebottom of those track sections. In accordance with a preferredembodiment of this invention each stop is preferably in the form of apop-rivet located approximately 0.25 inch from the bottom of theassociated track section. However, other forms of stops, e.g., a ledge,a wall, etc., can be used in lieu of a pop-rivet.

As should be appreciated by those skilled in the art, by having thetracks 46 holding the upper screen members off-set, e.g., set back, fromthe tracks 44, the gardener can readily grasp the particular screenmember desired to be moved or removed. This enables the gardener to liftor otherwise remove any lower (small animal) screen member 34 to work inthe garden through opening provided by the lifted or removed lowerscreen member, without needing to remove the upper (large animal) screenmember located immediately above it.

While not shown, each corner post or frame member 30A includes two pairof projecting walls or flanges. Each pair of walls or flanges is locatedat the bottom-most portion of the corner post or frame member 30A on thesurfaces from which the track sections 44 and 46 project. The walls orflanges of pair are spaced apart by a distance just slightly larger thanthe thickness of the planks or beams 26, to enable a respective end of aplank or beam to be received therein to form the base. Each side post orframe member 30B includes three pair of projecting walls or flangeswhich are located at the bottom-most portion thereof. The walls orflanges of two of the pairs project inward from the respective surfacesof the post or frame member 30B from which the track sections 44 and 46project. In addition, a third of the three pairs of walls or flangesprojects inward from the inner surface of the side post or frame member30B. The walls or flanges of each pair are also spaced apart by adistance just slightly larger than the thickness of the planks or beams26, to enable a respective end of a plank or beam to be receivedtherein. Thus, the walls or flanges projecting inward from the innersurface of the side post or frame member 30B receive a respective end ofa plank or bean to divide the base 22 into the two beds 28A and 28B.

It should be pointed out at this juncture that the height of the wallsor flanges of each corner and side post or frame member is sufficient toaccommodate two or more planks or beams that are stacked up as shown inFIGS. 1 and 5 to produce a raised bed whose height is a multiple of theheight of any of the planks or beams.

While not shown a wire mesh is also preferably disposed under the beds28A and 28B to protect against the incursion of burrowing animals.

It should be pointed out at this juncture, that various changes can bemade to the system of this invention. For example, the post or framemembers 30 need not be of square cross section, e.g., they can be ofround cross section. Moreover, the corner members need not be arrangedso that the upper and lower track sections are perpendicular to eachother. Thus, they can be at an obtuse or acute angle to each other, sothat the resulting enclosure is not rectangular or square shaped.Moreover, the track sections holding the lower screen members may be setback from the track sections holding the upper screen members. Furtherstill, the system may be configured to provide only a single bed insteadof the two beds shown in FIG. 1. In fact the system may be configured tocreate any number of beds. Further still, the screened enclosure may beconstructed so that there is only one upper and one lower screen member,with both screen members being individually slidable to any desiredposition and also individually removable. In fact, the subject inventioncontemplates a raised bed system in which the upper and lower screenmembers are individually removable from the post or frame members, butare not slidably mounted therein. Further still, the subject inventioncontemplates a raised bed utilizing only a single level of plural screenmembers, e.g., a plurality of lower screen members, each of which isindividually slidably removable from its associated frame sections.Further yet, the size of the screens, and their number is a matter ofchoice. Thus, for example, the screens may be designed to fit a fivefoot section of garden so that easy access to the bed to facilitateplanting and harvesting can be readily accomplished without the gardenerhaving to step into the bed and compress its soil.

Irrespective of the construction of the system 20, it is alsocontemplated that other devices and assemblies can be incorporated in itor used with it. For example, while not shown, the system may include atrellis system to permit vertical gardening within the screenedenclosure. In addition, the system 20 may include irrigation system,e.g., a battery operated and automatic “drip irrigate” system toirrigate the bed. That irrigation system may include a “rain sensor” tointerrupt the automatic irrigation cycle if there is a substantialamount of rain. The system may also include an aviary net arranged to bemounted over the bed to keep out birds, squirrels, etc.

Without further elaboration the foregoing will so fully illustrate ourinvention that others may, by applying current or future knowledge,adopt the same for use under various conditions of service.

What is claimed is:
 1. A system for disposition on the ground forgrowing plants, said system comprising a base and a screened enclosure,said base being arranged to be disposed on the ground and having aplurality of interconnected sections forming a hollow enclosure intowhich a growing medium can be disposed, said screened enclosure beingmounted on said base encircling said hollow enclosure, said screenedenclosure comprising a plurality of elongated frame members, at leastone upper screen member and at least one lower screen member, each ofsaid screen members having an opposed pair of side edges, a top edge anda bottom edge, said plurality of elongated frame members being connectedto said base and extending upward therefrom, a first one of said framemembers and a second one of said frame members defining a gaptherebetween, each of said first and second frame members comprising arespective section arranged to receive a respective side of said lowerscreen member, wherein said bottom edge of said lower screen member canbe placed in a position immediately adjacent said base, each of saidfirst and second frame members additionally comprising a sectionarranged to receive a respective side of said upper screen membertherein, wherein said bottom edge of said upper screen member can beplaced in a position immediately adjacent said top edge of said lowerscreen member, each of said upper and lower screen members beingarranged to be individually removed from its respective section of itsassociated frame members to enable each of said screen members to beindividually removed from said frame members.
 2. The system of claim 1wherein each of said first and second frame members comprise a firsttrack section arranged to slidably receive a respective side of saidlower screen member therein wherein said bottom edge of said lowerscreen member can be slid to a position immediately adjacent said base,and wherein each of said first and second frame members additionallycomprises a second track section arranged to slidably receive arespective side of said upper screen member therein wherein said bottomedge of said upper screen member can be slid to a position immediatelyadjacent said top edge of said lower screen frame, said lower screenmember being arranged to be individually slid out of said first tracksection of said first and second track members to enable said lowerscreen member to be individually removed from said screened enclosure,said upper screen member being arranged to be individually slid out ofsaid second track section of said first and second track members toenable said upper screen member to be individually removed from saidscreened enclosure.
 3. The system of claim 2 wherein said screenedenclosure comprises plural upper screen members and plural lower screenmembers, and wherein respective ones of said plural upper screen membersand respective ones of said plural lower screen members are slidablydisposed between adjacent frame members, with said bottom edge of eachof said lower screen members being disposed immediately adjacentrespective portions of said base, and with said bottom edge of each ofsaid upper screen members being disposed immediately adjacent said topedge of a respective one of said lower screen members.
 4. The system ofclaim 1 wherein each of said screen members comprises a peripheral framesurrounding a wire mesh panel.
 5. The system of claim 2 wherein each ofsaid screen members comprises a peripheral frame surrounding a wire meshpanel.
 6. The system of claim 1 wherein said upper screen member is inthe form of a panel of a first size woven wire mesh and wherein saidlower screen member is in the form of a panel of a second size wovenwire mesh, said first size being greater than said second size.
 7. Thesystem of claim 2 wherein said upper screen member is in the form of apanel of a first size woven wire mesh and wherein said lower screenmember is in the form of a panel of a second size woven wire mesh, saidfirst size being greater than said second size.
 8. The system of claim 4wherein each of said screen members comprises a peripheral framesurrounding a wire mesh panel.
 9. The system of claim 5 wherein each ofsaid screen members comprises a peripheral frame surrounding a wire meshpanel.
 10. The system of claim 2 wherein each of said first and secondframe members comprises a lower portion and an upper portion and whereinsaid first track section is located at said lower portion of said firstand second frame members, and wherein said second track section islocated at said upper portion of said first and second frame members.11. The system of claim 10 wherein each of said first and second framemembers comprises an outside surface and an oppositely disposed insidesurface, with said inside surface being directed towards said hollowenclosure of said base, and wherein said second track section is locatedadjacent said inside surface and said first track section is locatedadjacent said outside surface, whereupon when said upper screen memberis disposed in said second track sections of said first and second framemembers, and said lower screen member is disposed is said first tracksections of said first and second frame members, said upper screenmember is set back with respect to said lower screen member.
 12. Thesystem of claim 3 wherein each of said frame members comprises a lowerportion and an upper portion and wherein said first track section islocated at said lower portion of said first and second frame members,and wherein said second track section is located at said upper portionof said frame members.
 13. The system of claim 10 wherein each of saidframe members comprises an outside surface and an oppositely disposedinside surface, with said inside surface being directed towards saidhollow enclosure of said base, and wherein said second track section islocated adjacent said inside surface and said first track section islocated adjacent said outside surface, whereupon when said upper screenmembers are disposed in said second track sections of said framemembers, and said lower screen members are disposed is said first tracksections of said frame members, said upper screen members are set backwith respect to said lower screen members.
 14. The system of claim 11wherein each of said upper screen members is in the form of a panel of afirst size wire mesh and wherein each of said lower screen members is inthe form of a panel of a second size wire mesh, said first size beinggreater than said second size.
 15. The system of claim 13 each of saidupper screen members is in the form of a panel of a first size wovenwire mesh and wherein each of said lower screen members is in the formof a panel of a second size woven wire mesh, said first size beinggreater than said second size.
 16. The system of claim 10 wherein saidsecond track section includes a lower end portion and a projectionextending outward from said lower end portion of said track to act as astop to prevent said upper screen member from falling out of said secondtrack section.
 17. The system of claim 12 wherein said second tracksection includes a lower end portion and a projection extending outwardfrom said lower end portion of said track to act as a stop to preventsaid upper screen member from falling out of said second track section.18. A system for disposition on the ground for growing plants, saidsystem comprising a base and a screened enclosure, said base beingarranged to be disposed on the ground and having a plurality ofinterconnected sections forming a hollow enclosure into which a growingmedium can be disposed, said screened enclosure being mounted on saidbase encircling said hollow enclosure and comprising a plurality ofelongated frame members and a plurality of screen members, each of saidscreen members having an opposed pair of side edges, a top edge and abottom edge, said plurality of elongated frame members being connectedto said base and extending upward therefrom, with adjacent frame membersdefining a respective gap therebetween, each of said frame memberscomprising a respective track section arranged to slidably receive arespective side of a respective one of said screen members therein,wherein each of said screen members is slidably located within arespective gap, whereupon said bottom edge of each of said screenmembers can be slid to a position immediately adjacent said base, andwherein each of said screen members is arranged to be individually slidout of their respective tracks to enable each of said screen members tobe individually removed from said frame members.
 19. The system of claim18 wherein each of said screen members comprises a peripheral framesurrounding a wire mesh panel.